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Numerical and analytical modeling of advective travel times in realistic three-dimensional fracture networks
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (Hydrology)
2011 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 47, W02506- p.Article in journal (Refereed) Published
Abstract [en]

Travel time distributions obtained from advective transport in multiple realizations of realistic discrete fracture network simulations are analyzed using the truncated one-sided stable distribution, which has previously been shown to generalize both the advectiondispersion solution as well as one-sided stable distributions. Using this model, it is shown that the Fickian assumption inherent in the advection-dispersion equation generally fails, despite the first two moments of travel time essentially scaling linearly with distance. It is also observed that the equally probable realizations drawn from the ensemble can produce a wide range of behavior under the current configuration, such that Fickian conditions are almost obtained in some cases for increasing scales. On the basis of a small-scale calibration against particle breakthrough, the model is then shown to successfully predict limiting bounds of transport for a one order of magnitude increase in scale. Correlation in particle velocity is explicitly shown to be significant for scales close to the characteristic Lagrangian segment length. The network configuration is obtained from extensive site characterization data at the Laxemar region in Sweden and represents a block-scale domain of reasonably sparse background fractures.

Place, publisher, year, edition, pages
2011. Vol. 47, W02506- p.
Keyword [en]
Flow, Radionuclide transport, Fractured media, Crystalline rock, Modelling, Travel time
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:su:diva-55301DOI: 10.1029/2010WR009290ISI: 000287039900001OAI: oai:DiVA.org:su-55301DiVA: diva2:402445
Available from: 2011-03-08 Created: 2011-03-08 Last updated: 2017-12-11Bibliographically approved

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